Tamron Lens Definitions

Optical/Mechanical Feature Key
IF Internal Focusing ASL Aspherical
LD Low Dispersion AD Anomalous Dispersion
XR Extra Refractive Index Glass Di Digitally Integrated Design
Di II Lenses for Digital SLR Cameras Only ADH AD-Hybrid Aspherical
SP High-performance specifications FEC Filter Effect Control
LAH LD-Hybrid Aspherical ZL Zoom-Lock Mechanism
AF/MF AF/MF Switchover Mechanism VC Vibration Compensation
Built-In Motor Built-In Motor for Nikon Cameras